Research on Time Synchronization Method for Train Distributed System
Aiming at the inconsistency of the system clock of each sub-node in the vehicle distributed monitoring system,a system synchronization method is proposed based on software which does not rely on additional clock synchronization devices and has higher accuracy than NTP protocol.Firstly,the time deviation between each child node and the central node is calculated,and this time deviation is not used to adjust the local clock of the child node,but is sent to the central node together with the data collected by the child node and the corresponding timestamp.The central node can correct the timestamp of the data reported by each device according to the time bias,so as to achieve the purpose of distributed system synchronization.In calculating the time deviation between the child node and the central node,compared with the traditional NTP network time protocol,the transmission delay of packets between the software application layer and the network card needs to be considered.In order to calculate this delay,a PTP reference host with higher accuracy than NTP is introduced to estimate the delay in advance,and the time offset accuracy of the distributed system is higher than that of the traditional NTP protocol.
in traindistributed systemsynchronizationsystem clock deviationnetwork time protocol
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